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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274350d9df850681d598d4fc2aa73858cfaa5535020b02d365ab392d7786b979' 
  AND token = '9WHxT/30zfZgoR8bhqMWkY0qVAGPfR30xl+9sRXp7G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}